cleanup vs killing

cleanup and killing both are nouns.

Word	Noun	Adjective	Verb	Adverb
cleanup	Yes	No	No	No
killing	Yes	Yes	No	No

As nouns, cleanup and killing are synonyms defined as:

cleanup (noun)	killing (noun)
the act of making something clean	the act of terminating a life
(baseball) the fourth position in the batting order (usually filled by the best batter on the team)	an event that causes someone to die
a very large profit	a very large profit

cleanup (adjective)	killing (adjective)
	very funny